Journal of Ophthalmology / 2017 / Article / Tab 1

Clinical Study

Long-Term Follow-Up of Intrastromal Corneal Ring Segments in Paracentral Keratoconus with Coincident Corneal Keratometric, Comatic, and Refractive Axes: Stability of the Procedure

Table 1

Patients’ demographics: age, pre-ICRS implantation spherical equivalent (SE), manifest refraction (refractive sphere and cylinder), undistance visual acuity (UDVA) (logMAR scale), corrected distance visual acuity (CDVA) (logMAR scale) pre-keratometry (K) value, and root mean square (RMS) for coma-like aberration shown as mean ± standard deviation (SD) and range.

CharacteristicWhole sampleGroup I (younger patients)Group II (older patients)

Eyes (n)582335
Age (years)34 ± 9.225.35 ± 3.8840.23 ± 6.56
Mean SE (D)−2.74 ± 3.38−3.32 ± 4.57−2.36 ± 2.30
Mean refractive sphere (D)−0.50 ± 3.24−1.08 ± 4.45−0.22 ± 2.11
Mean refractive cylinder (D)−4.36 ± 1.87−4.49 ± 2.02−4.28 ± 1.78
UDVA (logMAR)0.83 ± 0.310.90 ± 0.310.74 ± 0.32
CDVA (logMAR)0.16 ± 0.170.18 ± 0.130.10 ± 0.20
Mean K minimum (D)44.41 ± 3.0844.00 ± 2.5244.62 ± 3.47
Range K minimum (D)39.25 to 5340 to 49.7539.25 to 53
Mean K maximum (D)48.65 ± 3.6348.79 ± 2.8448.46 ± 4.11
Range K maximum (D)42.50 to 5844.25 to 55.542.50 to 58
RMS for coma-like for 4.5 mm of pupil size (μm)1.03 ± 0.650.96 ± 0.651.12 ± 0.60
Range RMS for coma-like (μm)0.1 to 2.230.1 to 2.230.1 to 2.08

Statistically significant between groups.

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